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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net   $ 0.1
Notional Amount of Interest Rate Derivatives $ 45.0